[Android] Fix Microdump generation when Seccomp-BPF is enabled.

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <fcntl.h>
 #include <linux/net.h>
@@ skipping 34 matching lines @@
 // https://android.googlesource.com/platform/bionic/+/lollipop-release/libc/private/bionic_prctl.h
 #if !defined(PR_SET_VMA)
 #define PR_SET_VMA 0x53564d41
 #endif
 
 // https://android.googlesource.com/platform/system/core/+/lollipop-release/libcutils/sched_policy.c
 #if !defined(PR_SET_TIMERSLACK_PID)
 #define PR_SET_TIMERSLACK_PID 41
 #endif
 
+#ifndef PR_SET_PTRACER
+#define PR_SET_PTRACER 0x59616d61
+#endif
+
 #endif  // defined(OS_ANDROID)
 
 #if defined(__arm__) && !defined(MAP_STACK)
 #define MAP_STACK 0x20000  // Daisy build environment has old headers.
 #endif
 
 #if defined(__mips__) && !defined(MAP_STACK)
 #define MAP_STACK 0x40000
 #endif
 namespace {
@@ skipping 71 matching lines @@
 }
 
 ResultExpr RestrictPrctl() {
   // Will need to add seccomp compositing in the future. PR_SET_PTRACER is
   // used by breakpad but not needed anymore.
   const Arg<int> option(0);
   return Switch(option)
       .CASES((PR_GET_NAME, PR_SET_NAME, PR_GET_DUMPABLE, PR_SET_DUMPABLE
 #if defined(OS_ANDROID)
               ,
-              PR_SET_VMA, PR_SET_TIMERSLACK_PID
+              PR_SET_VMA, PR_SET_TIMERSLACK_PID, PR_SET_PTRACER
 #endif
               ),
              Allow())
       .Default(CrashSIGSYSPrctl());
 }
 
 ResultExpr RestrictIoctl() {
   const Arg<int> request(1);
   return Switch(request).CASES((TCGETS, FIONREAD), Allow()).Default(
       CrashSIGSYSIoctl());
@@ skipping 148 matching lines @@
   static_assert(4 == sizeof(clockid_t), "clockid_t is not 32bit");
   const Arg<clockid_t> clockid(0);
   return Switch(clockid)
       .CASES((CLOCK_MONOTONIC, CLOCK_MONOTONIC_COARSE, CLOCK_PROCESS_CPUTIME_ID,
               CLOCK_REALTIME, CLOCK_REALTIME_COARSE, CLOCK_THREAD_CPUTIME_ID),
              Allow())
       .Default(CrashSIGSYS());
 }
 
 }  // namespace sandbox.